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/*!
  \class ScaleCrop

  \brief A special filter for generating previews from higher level previews.

This filter does not work in the general case and should not be
available in the default filter factory. The source image must be a
full image or a non-cropped preview, the target image should be
smaller than the source.

Supports options: SizeAfter (the requested size for the resulting
preview), CropRect (the area to be cropped into, in full-screen
coordinates - leave unspecified for no cropping).

Default behavior: does nothing.
*/

#ifndef SCALE_CROP_H
#define SCALE_CROP_H

#include "quillimagefilter.h"
#include "quillimagefilterimplementation.h"

class ScaleCropPrivate;

class ScaleCrop : public QuillImageFilterImplementation
{
public:
    ScaleCrop();
    ~ScaleCrop();

    QuillImage apply(const QuillImage &image) const;

    QSize newFullImageSize(const QSize &fullImageSize) const;
    QRect newArea(const QSize &fullImageSize, const QRect &area) const;

    bool setOption(const QString &option, const QVariant &value);
    QVariant option(const QString &option) const;
    const QStringList supportedOptions() const;

    virtual const QString name() const { return QuillImageFilter::Name_ScaleCrop; }

    QuillImageFilter::QuillFilterRole role() const;

private:

    static int transform(int x, int numerator, int denominator);

    ScaleCropPrivate *priv;
};

#endif
